This is the 390th most frequent Czech word.
mnoha
"Many" or "of many."
Here, 'mnoho' serves as an indefinite quantifier, expressing a large quantity of 'guests'.
Na oslavě se sešlo mnoho hostů.
Many guests gathered at the celebration.
Here, 'mnoha' describes a large count of 'interesting books' in the library.
Knihovna je plná mnoha zajímavých knih.
The library is full of many interesting books.
In this instance, 'mnoha' (dative plural form) indicates 'many people' who are affected by the absence of 'peace'.